2Loose Willy's Gasser Project, .....................

REAR TIRES & FENDERS FIT, FIT, FIT.....

Added a new page to continue this discussion, link here:

Tires, Gears, Tires, Gears...... Find The Best Setup....



UPDATE #2: for April, 2013:

Ran the new MT racing slicks on the road a bit, got 66 mph at 2500 rpm with 3.50 rear gears. That calculates to an effective rolling diameter of 31". The tire are spec'd as 33", but for rear gear determination I need to use the "real" diameter of 31". The tire loses an inch on the bottom just from the weight of the car, and this was calc'd out on the road moving at 66 mph.



UPDATE: April, 2013:

Wanted some taller street tires so I could run 4.11's or even 4.56's on the street, and then be able to run those gears at the track. Got a little bit crazy awhile back and bought a pair of MT 33" tall slicks, gonna need more gear to pull those tall tires at the track. Found these Hoosier 31X12.50R15 tires and put them on a pair of 12" wide rims I had, specs called for 9"-11", but had no problem putting them on these rims and they look good. Specs said they were 31" tall, but running them on the road with a GPS to get actual speed vs rpm, it calcs out as actually 27.8" real rolling diameter. With 4.11 gears in fifth (1:1) it was running 50 mph at 2500 rpm, and with 3.50 gears it was running 59 mph at 2500 rpm. Both those data sets calc. to 27.8" rolling diameter. When I measured the acual unloaded tire diameter off the car they measured 30.5". So my 4,000 lb car (with me included) reduces the rolling radius on those tires out on the road by 1.35" [Calcs=(+30.5-27.8)/2].....

That's a lot of tire size loss, and I may have to go back to 3.00 gears to get good cruising performance on the road. I like to run at about 70 mph at 2500, with the 3.50 gears I have in there now, it will run about 3,000 at 70, and I don't like to do that for very long....

Here's a pic of the Hoosiers, wish they really were 31" tall:

I have another third member set up with 4.11 gears for the track. After finding out I had flat towing problems (it kept wanting to go straight in the corners), I pulled the spool out and put a Detroit Locker back in. Am thinking I should stick those 4.11's in with the supposedly 33" tall slicks and take it out on the road and see just how much diameter loss I get. I know those MT slicks are supposed to "grow" with rpm, but I am not very convinced the the portion of the tire on the pavement will change very much with a 4,000 lb car pushing back on them....

I should find a straight stretch of open road with nobody around and open it up with the gpm running, and compare the rpm to the mph at various speeds, then I can calc the actual rolling diameter...

UPDATE: March, 2013....

Put on some Mickey Thompson 33" tall slicks, 10.5" wide, on 10" wide steel rims, good clearance with the frame on the inside, but it hits the body panels at the wheel well openings in front and back....

I'm not a big fan of the circular cutouts that are supposed to "exemplify" the 60's gassers, as I had two uncles who ran '55 gassers at the Vaca Valley Drag Strip in NorCal in the 60's, and they raised and widened the original openings on their cars....

So I decided to do it that way also. It takes a little more work, but it looks way better IMO, and the circular cutouts may have caught on lately, but it certainly was not the only way '55 Chevy gassers were done for tire clearance "back in the day"....

Started at the front and cut to move that front section of the lip forward about 2" and up about 3"...

Yeah, it looks like the rear doors will be in the way on my four door, but.... Just wait.....

Then cut across above the opening and down behind it to lift out the entire lip section....

Taped it back in 3" up with the front piece 2" forward....

The rear door will have to be trimmed, but there is plenty of room under the door on my four door to do this...

Everything taped in place and it looks pretty good...

End of the day, and I had to drive it home, so I pulled off all the pieces and put the road tires back on after this shot....

On the way home, stopped by a buddy's who had some ford 9" ring and pinions for sale, bought a 4.11, a 4.33, and a 4.56.... I'll post my calc sheet on my possible shifts and speeds with these 33" tires and each of those gears. I have a couple of third members laying around, could setup each gear set and change 'em at the track if necessary to get the best combo. Intend to start with the 4.56 setup first....

Next day, started notching and fitting the front piece first.... These are my street tires in these pix, they are 28" tall....

Tacked it in place and it looks pretty good....

Found a lot of rot in there as I was cutting away, so repair and reinforce time....

Yup, time to trim the door to fit....

Trimmed and fitted the bottom front piece in place,

Will have to fab a piece to fill in that gap....

Matched up the top piece to the front piece, cut out some more sheet metal, fitted it in place and tacked it in, enough for now, time to head home for dinner....

Ran some Excel spreadsheet numbers for my Doug Nash 5 speed against the 4.11, 4.33 and 4.56 rear gears, using 6,000 rpm max.

Also show the current street configuration, with 3.00 gears, the first box is with my 26" tall street tires, the second box is with the 28" tall DOT cheater slicks...

The second set of boxes shows the drag slicks with 3.50 and 4.11 gears,

The third set of boxes shows the drag slicks with 4.33 and 4.56 gears.

I'm going to set it up first with a spool and the 4.56 gears. If I can make the power, it shows crossing the lights in fifth at 6,000 rpm and 129 mph. Very optimistic in a 4K pound car plus driver, running pump gas in a mild cam 430 ci motor, 8:1 pistons, 7 lbs boost, and a 5 speed stick.... But, gotta try, ya just never know....

If you look at the 3.50 gears with the 33" tall tires, look at the 2500 rpm in 5th gear.... Cruising at 70, and the other gears at 2500 with that setup are 21 mph in 1st, then 33 in 2nd, 45 in 3rd, 57 in 4th, and 70 in 5th, a great street set up for just cruising! Now I gotta find a good looking pair of 33" tall street tires for this rig....

More later......

Here's some links to earlier pix:

Back to the '55 Gasser Home Page

Link To Final Build, Page 3.....

Added Some Ladder Bar Restraints....

New Front Axle Install.....

More Mods On The Front Suspension

Put Some Mufflers On To Quiet Down This Beast!

Did Some Smokey Burnouts!

LINK to youtube video 1 : STARTIN' THIS MOTOR UP!!!

LINK to youtube video 2 : LET'S DRIVE THIS BABY AROUND A BIT !!!!

LINK to youtube video 3 : STILL DRIVE'N THIS BABY AROUND !!!!

LINK to youtube video 4 : WARMING IT UP FOR A TUNING SESSION !!!!

Final Build, Let's Get This Car On The Road (page 2).....

Final Build, Let's Get This Car On The Road (page 1).....

Olds 425 Motor Final Build (Page 5)

Olds 425 Final Build (Page 4)

Olds 425 Final Build (Page 3)

Assembling The Blower Motor (Page 2)

Reworking an Olds 425 to take a 6-71 huffin on it. (Page 1)

Putting In the Gages and Electrical System......

First Trip To The Maui Track.....

Working On The Fuel System

Gettin The Front Brakes to Work .......

Olds 425 Final Build Page

Fabbing A Pair Of Drive Shaft Safety Hoops

More Patches, More Patches (page 2).......

Patching Up All The Sheet Metal Holes (page 1).....

Interior Views, Seats Modified and Upholstered!!!

Twelve Point Cage Build Finally Done!

Working On The Fuel System

Adding A Front Sway Bar

Whacking And Welding Some Fenderwell Headers!

Dog Dish Hubcaps? Air Filter Rain Covers? Looks Good To Me........

Setting Up The Rear Axle and Suspension page 2

Setting Up The Rear Axle and Suspension page 1

Cutting A Hole In The Hood, and Setting The Fenders....

Installing The Radiator

Setting Up The Tilt Front End

Setting Up The Steering and Suspension 2

Setting Up The Steering and Suspension

Starting To Fit Some Parts Here and There....

Setting Up The Front Axle 2

Setting Up The Front Axle 1

Narrowing The Front Axle

Found This Ford F100 Front Axle

Assembling The Blower Motor

Reworking an Olds 425 to take a 6-71 huffin on it.

Trial fit for the 6-71, a Don Hampton special.

Pulled apart a '67 Olds 400 motor for spare parts.....

Did Some Porting Work on some Edelbrock Olds Heads

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